From f6e07efd784d90692cbecb5b2938556f29b5fb3e Mon Sep 17 00:00:00 2001
From: Mike Zeller <mike@oxidecomputer.com>
Date: Fri, 30 Oct 2026 19:38:15 +0000
Subject: [PATCH] vsock test flake in
 credit_update_sent_after_flushing_half_buffer

Pull Request: https://github.com/oxidecomputer/propolis/pull/1242
---
 lib/propolis/src/vsock/poller.rs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/propolis/src/vsock/poller.rs b/lib/propolis/src/vsock/poller.rs
index d3d18513f..0646d9766 100644
--- a/lib/propolis/src/vsock/poller.rs
+++ b/lib/propolis/src/vsock/poller.rs
@@ -1516,7 +1516,9 @@ mod test {
         accepted.read_exact(&mut buf).unwrap();
         assert!(buf.iter().all(|&b| b == 0xAB));
 
-        // Look for a CREDIT_UPDATE in the RX used entries
+        // Look for a CREDIT_UPDATE in the RX used entries.
+        // NB: It arrives asynchronously so we attempt to wait on the condition.
+        wait_for_condition(|| harness.rx_used_idx() >= 2, 5000);
         let rx_used = harness.rx_used_idx();
         assert!(rx_used >= 2, "expected at least RESPONSE + CREDIT_UPDATE");